Response I got from the NASA press release contact about being able to watch this:
"Thank you for your message. Unfortunately, NASA TV is not available in HD, and this HD feed is targeted for the media to distribute on their HD channels."
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Well, I did a little research, and I found this relating to a prior release of HD video by NASA TV:
http://www.dbstalk.com/showthread.php?t=126270
Response I got from the NASA press release contact about being able to watch this:
"Thank you for your message. Unfortunately, NASA TV is not available in HD, and this HD feed is targeted for the media to distribute on their HD channels."